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For Identifiers (just the complete URI and local part, not about mechanisms)

	HDL	PURLz
permanent	Yes	? Yes
permanently resolve to a digital object	Yes	? Yes
unique within our PID system without the DNS name portion of the	Yes; very flexible naming, including pseudo/paths	? Yes, but
URL	?	?
works with VIVO, arXiv, OAIS (CUL), Voyager Catalog, and WorldCat etc.	Yes	does nothing in and of itself to not work with existing systems;
resolvable through a web browser	Yes	?
Simplicity	Yes	Yes
support for a local namespace prefix and an identifier part	Yes	Yes
support for opaque identifiers	Yes	Yes
Local part should not be Cornell branded	completely flexible	completely flexible
may be surrogate for physical object	Yes	Yes
should be short (so use 26 letters plus numbers)	Yes	Yes
should be easy to copy by hand	depends on the length	depends on the length and/or layout

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